Steel square tube 1.Material:Q195 Q235 2.Thickness:1.0mm-30.0mm 3.Width:15x15 -500x500mm 4. Single Random Length and double Random Length. SRL:3M-5.8M DRL:10-11.8M or As clients requested length fixed length(5.8m, 6m, 12m) 5.Surface treatment:black paint, varnish, oil, galvanized 6.Standard:ISO 9001:2008, SGS more...